If you have a good competitive moveset for Darmanitan, post an answer below and upvote the best ones. Movesets for its pre-evolutions, if any, can also be shared on this thread.

Be sure to include full set details in your post, e.g. items, abilities, natures and EVs. Some detail, including the intended game mode for your set, is also appreciated. Access the full list of guidelines here.

EVs: Attack + Speed (probably some in the way of Def/SpDef)
Ability: Sheer Force*
Item: Life Orb or Choice Band

Fire Punch or Flame Charge (I assume the Speed will still rise with Sheer Force)

Hammer Arm

Earthquake

Stone Edge

Type-wise this covers EVERYTHING.

* Daruma Mode is kinda lame, you need to mix attack and special attack but can only use one at a time (140 one stat vs 30 the other... no thanks). Sheer Force is great, and coupled with those items can probably OHKO everything it hits.

Flare Blitz is a strong Fire-type move and takes recoil that helps turn Zen Mode.
Psychic gains STAB
Focus Blast is to take some Dark-types. Better you go attacking with Flare Blitz. If you and the oponent survive you may use Focus Blast.
Solar Beam is to to cover Water-, Rock- and Ground-types. You can start using the Solar Beam in Standart Mode. When you are charging the oponent may go using a Water-/Rock-/Ground-type move. You will have 100% chance to survive because the Focus Sash will defend you. But normally you will be the second to deal damage when you became Zen Mode and you will die but, with the Spd IV training you have a chance to be the first to attack. Now you can deal Solar Beam with high damage to oponent. Every times it works to me...

With its Choice Scarf, it can outspeed a lot of stuff, and U-Turn helps scout out your opponent's moveset. With a lot of water moves being special, its Careful nature and 4 Sp. Def. EVs can help it survive a few of them. You shouldn't really use Flare Blitz a lot, as it eats away at Darmanitan's HP, but Rock Slide's power skyrockets when you pair it with its Sheer Force ability and 252 Atk EVs. Earthquake can help you dish out an easy OHKO to annoying Rock- Types like Gigalith or Golem (providing they don't have Sturdy).

heat rock is to keep sunny day up longer but sitrus berry is to recover none necisaary dammage sunny day weakens water type moves and makes solar beam a one turn move hope this move set works for every body else. :)

Role: Sweeper
Flare Blitz: STAB, great move to use with Darmanitan's Physical Attack stat
Grass Knot: Covers Water, Ground, and Rock. Most Rock and Ground types are heavy so this move works good
Stone Edge: Physical move and it takes down popular Pokemon like Talonflame
Earthquake: A very powerful move to go with its attack stat

Flame Charge (STAB/raise speed)Rest (Heal HP/wake up with Lum Berry/change out of Zen Mode)Psychic (STAB)Fire Blast (STAB/could use another special Fire move)

Essentially, this is a set catering to Darmanitan's Zen Mode. Use Flame Charge to raise your speed until you're changed into Zen Mode, then fire away with Psychic/Fire Blast at breakneck speeds! Use Rest if you want to change out of Zen Mode.

I've used this set with success many times, and it always surprises people when I use Flame Charge/Rest!

I feel like its hidden ability is too unique to not use but its stats are all over the place. I came up with this set and it seems to work pretty well.
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Neutral Nature
Ability: Zen Mode
EV: Hp 244, Def 132, SpDef 132
Item: Bright powder/Lum Berry/Focus Sash/Life Orb. Suggestions?

Moveset:
Substitute- great defensive move and helps get you into zen mode.
Focus Punch- high power! Coverage and works very well with sub.
Psychic- STAB
Flamethrower/Fireblast- STAB

The strat is pretty obvious, I think. Set up sub, use focus punch until you get into zen mode then go for special attacks. The EV spread will ensure that you go into zen mode after 2nd sub and the bulk will help you survive once in zen mode. I prefer Life Orb on this but if someone has a better suggestion, let me know. Thoughts?